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<title>Gradient</title>
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p {
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  text-align:center;
  color: #000;
  font-size:24px;
  /*background-image:linear-gradient(to left, red, orange,yellow,green,blue,indigo,violet);*/
  background-image:linear-gradient(to right, red, orange,yellow,green,blue,indigo,violet);
  background-image:linear-gradient(to top right, red, orange,yellow,green,blue,indigo,violet);
  background-image:linear-gradient(to top left, red, orange,yellow,green,blue,indigo,violet);
  background-image:linear-gradient(to top, red, orange,yellow,green,blue,indigo,violet);
  background-image:linear-gradient(to bottom, red, orange,yellow,green,blue,indigo,violet);
  background-image:linear-gradient(-45deg, red, orange,yellow,green,blue,indigo,violet);
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　　<p>右下角向左上角的线性渐变背景</p>
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